Humans have long utilized the surrounding landscape and organisms as life resources and developed new species of organisms through cultivation. The utilization of biodiversity has played a vital role in advancing human culture, speci cally regarding food and habitation. This accumulated knowledge on the ecosystem has transcended geographical boundaries of rivers, mountains, and seas, spreading to other countries where it has been adjusted or adopted. In addition, the languages and dialects of ethnic minorities, which comprise the biocultural diversity within the ecosystem, are becoming fragmented or disappearing as a result of syncretism due to impact of rapid westernization, urbanization, and development. Indigenous languages contain countless terminologies that re ect ecological characteristics of organisms and resources within a speci c region, and if the ecosystem no longer exists, the language also disappears. Preserving and sustainably using indiscreetly-exploited natural ecosystems and biological resources is the way to protect and sustain the value of culture. Culture develops with high dependence on biological resources. World organizations such as IUCN, CBD, and UNESCO have already reported that the growing human population will increasingly rely on bio(resource)diversity. Like such, the relationship between biodiversity and cultural diversity, as demonstrated through exibility, dynamics, and complementation observed during the interaction between these two paradigms, has emerged as a crucial model for achieving balance and coexistence necessary for human survival in the future. This paper will discuss the value of biocultural diversity, focusing on the relationship between geographical and typological characteristics of the island and seascape as well as the utilization of ecological resources. This study will further discuss how human geographical changes caused by socioeconomic in uence within an island affect biocultural diversity and islandness through cases of island region in South Korea,